gistfile1.m

#import <Foundation/Foundation.h>

@interface NSInvocation (blah)

+ (NSInvocation *) invocationWithTarget:(id)target selector:(SEL)selector arguments:(void *)firstArgument, ... NS_REQUIRES_NIL_TERMINATION;
+ (NSInvocation *) undoInvocationWithTarget:(id)target selector:(SEL)selector arguments:(void *)firstArgument, ... NS_REQUIRES_NIL_TERMINATION;

@end

static NSUInteger const ARArgumentsListInvocationFirstArgumentIndex = 2;

@implementation NSInvocation (blah)

+ (NSInvocation *)invocationWithTarget:(id)target selector:(SEL)selector arguments:(void *)firstArgument, ... {
	void *argument = firstArgument;
	va_list argumentsList;
	va_start (argumentsList, firstArgument);
	
	NSInvocation *result = [self invocationWithTarget:target selector:selector firstArgument:argument argumentsList:argumentsList];
	va_end (argumentsList);
	
	return result;
}

+ (NSInvocation *) undoInvocationWithTarget:(id)target selector:(SEL)selector arguments:(void *)firstArgument, ... {
	void *argument = firstArgument;
	va_list argumentsList;
	va_start (argumentsList, firstArgument);
	
	NSInvocation *result = [self invocationWithTarget:target selector:selector firstArgument:argument argumentsList:argumentsList];
	va_end (argumentsList);
	
	return result;
}

+ (NSInvocation *)invocationWithTarget:(id)target selector:(SEL)selector firstArgument: (void *) argument argumentsList:(va_list) args {
	NSMethodSignature *methodSignature = [target methodSignatureForSelector:selector];
	NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:methodSignature];
	invocation.target = target;
	invocation.selector = selector;

	NSUInteger index = ARArgumentsListInvocationFirstArgumentIndex;
	while (argument) {
		NSString *assertDescription = [NSString stringWithFormat:@"Превышено допустимое количество аргументов (%zd из %zd возможных)", (index - ARArgumentsListInvocationFirstArgumentIndex + 1), (methodSignature.numberOfArguments - ARArgumentsListInvocationFirstArgumentIndex)];
		NSAssert((index < methodSignature.numberOfArguments), assertDescription);
		[invocation setArgument:argument atIndex:index];
		index++;
		argument = va_arg (args, void *);
	}

	return invocation;
}

@end

@interface SomeClass: NSObject

- (void) doSomething: (NSString *) arg1 withArg: (int) arg2 boolArg: (BOOL) arg3 shitCunt: (NSArray *) arg4;

@end

int main (void) {
	SomeClass *obj = [SomeClass new];
	NSString *str = @"lol";
	int i = 123;
	BOOL b = YES;
	NSArray *arr = @[@"ROOSTER"];
	NSInvocation *inv = [NSInvocation invocationWithTarget:obj selector:@selector (doSomething:withArg:boolArg:shitCunt:) arguments:&str, &i, &b, &arr, nil];
	[inv invoke];
	return 0;
}

@implementation SomeClass: NSObject

- (void) doSomething: (NSString *) arg1 withArg: (int) arg2 boolArg: (BOOL) arg3 shitCunt: (NSArray *) arg4 {
	NSLog (@"%@ %d %d %@", arg1, arg2, arg3, arg4);
}

@end